Which of the following biodegradable polymers is a copolymer?

APolyglycolic acid
BPHBV
CPolylactic acid
DPoly(3-hydroxybutanoic acid)

Answer: B

PHBV contains two different repeating units (3-hydroxybutanoate and 3-hydroxypentanoate). PLA, PGA and poly(3-hydroxybutanoic acid) each have a single type of repeat unit.

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